#!/usr/bin/perl -w
+# Known limitations:
+# - cannot add or remove binary files
+# - does not propagate permissions
+# - tells "ready for commit" even when things could not be completed
+# (eg addition of a binary file)
+
use strict;
use Getopt::Std;
use File::Temp qw(tempdir);
use Data::Dumper;
-use File::Basename qw(basename);
+use File::Basename qw(basename dirname);
unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
die "GIT_DIR is not defined or is unreadable";
}
-our ($opt_h, $opt_p, $opt_v, $opt_c );
+our ($opt_h, $opt_p, $opt_v, $opt_c, $opt_f, $opt_m );
-getopts('hpvc');
+getopts('hpvcfm:');
$opt_h && usage();
# resolve target commit
my $commit;
$commit = pop @ARGV;
-$commit = `git-rev-parse --verify "$commit"^0`;
+$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
chomp $commit;
if ($?) {
die "The commit reference $commit did not resolve!";
my $parent;
if (@ARGV) {
$parent = pop @ARGV;
- $parent = `git-rev-parse --verify "$parent"^0"`;
+ $parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
chomp $parent;
if ($?) {
die "The parent reference did not resolve!";
}
# find parents from the commit itself
-my @commit = `git-cat-file commit $commit`;
+my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
my @parents;
foreach my $p (@commit) {
if ($p =~ m/^$/) { # end of commit headers, we're done
$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
# grab the commit message
-`git-cat-file commit $commit | sed -e '1,/^\$/d' > .msg`;
+open(MSG, ">.msg") or die "Cannot open .msg for writing";
+print MSG $opt_m;
+close MSG;
+
+`git-cat-file commit $commit | sed -e '1,/^\$/d' >> .msg`;
$? && die "Error extracting the commit message";
-my (@afiles, @dfiles, @mfiles);
-my @files = `git-diff-tree -r $parent $commit`;
-print @files;
+my (@afiles, @dfiles, @mfiles, @dirs);
+my @files = safe_pipe_capture('git-diff-tree', '-r', $parent, $commit);
+#print @files;
$? && die "Error in git-diff-tree";
foreach my $f (@files) {
chomp $f;
- my @fields = split(m/\s+/, $f);
+ my @fields = split(m!\s+!, $f);
if ($fields[4] eq 'A') {
- push @afiles, $fields[5];
+ my $path = $fields[5];
+ push @afiles, $path;
+ # add any needed parent directories
+ $path = dirname $path;
+ while (!-d $path and ! grep { $_ eq $path } @dirs) {
+ unshift @dirs, $path;
+ $path = dirname $path;
+ }
}
if ($fields[4] eq 'M') {
push @mfiles, $fields[5];
# check that the files are clean and up to date according to cvs
my $dirty;
-foreach my $f (@afiles, @mfiles, @dfiles) {
- # TODO:we need to handle removed in cvs and/or new (from git)
- my $status = `cvs -q status "$f" | grep '^File: '`;
-
- unless ($status =~ m/Status: Up-to-date$/) {
+foreach my $d (@dirs) {
+ if (-e $d) {
+ $dirty = 1;
+ warn "$d exists and is not a directory!\n";
+ }
+}
+foreach my $f (@afiles) {
+ # This should return only one value
+ my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
+ if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
+ if (-d dirname $f and $status[0] !~ m/Status: Unknown$/
+ and $status[0] !~ m/^File: no file /) {
+ $dirty = 1;
+ warn "File $f is already known in your CVS checkout -- perhaps it has been added by another user. Or this may indicate that it exists on a different branch. If this is the case, use -f to force the merge.\n";
+ warn "Status was: $status\n";
+ }
+}
+foreach my $f (@mfiles, @dfiles) {
+ # TODO:we need to handle removed in cvs
+ my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
+ if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
+ unless ($status[0] =~ m/Status: Up-to-date$/) {
$dirty = 1;
warn "File $f not up to date in your CVS checkout!\n";
}
}
if ($dirty) {
- die "Exiting: your CVS tree is not clean for this merge.";
+ if ($opt_f) { warn "The tree is not clean -- forced merge\n";
+ $dirty = 0;
+ } else {
+ die "Exiting: your CVS tree is not clean for this merge.";
+ }
}
###
###
+print "Creating new directories\n";
+foreach my $d (@dirs) {
+ unless (mkdir $d) {
+ warn "Could not mkdir $d: $!";
+ $dirty = 1;
+ }
+ `cvs add $d`;
+ if ($?) {
+ $dirty = 1;
+ warn "Failed to cvs add directory $d -- you may need to do it manually";
+ }
+}
+
print "'Patching' binary files\n";
-my @bfiles = `git-diff-tree -p $parent $commit | grep '^Binary'`;
+my @bfiles = grep(m/^Binary/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit));
@bfiles = map { chomp } @bfiles;
foreach my $f (@bfiles) {
# check that the file in cvs matches the "old" file
# extract the file to $tmpdir and comparre with cmp
- my $tree = `git-rev-parse $parent^{tree} `;
+ my $tree = safe_pipe_capture('git-rev-parse', "$parent^{tree}");
chomp $tree;
my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`;
chomp $blob;
`git-cat-file blob $blob > $tmpdir/blob`;
- `cmp -q $f $tmpdir/blob`;
- if ($?) {
+ if (system('cmp', '-s', $f, "$tmpdir/blob")) {
warn "Binary file $f in CVS does not match parent.\n";
$dirty = 1;
next;
}
foreach my $f (@afiles) {
- `cvs add $f`;
+ system('cvs', 'add', $f);
if ($?) {
$dirty = 1;
warn "Failed to cvs add $f -- you may need to do it manually";
}
foreach my $f (@dfiles) {
- `cvs rm -f $f`;
+ system('cvs', 'rm', '-f', $f);
if ($?) {
$dirty = 1;
warn "Failed to cvs rm -f $f -- you may need to do it manually";
if ($opt_c) {
print "Autocommit\n $cmd\n";
- print `cvs commit -F .msg $commitfiles 2>&1`;
+ print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles);
if ($?) {
cleanupcvs(@files);
die "Exiting: The commit did not succeed";
}
sub usage {
print STDERR <<END;
-Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [ parent ] commit
+Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
END
exit(1);
}
sub cleanupcvs {
my @files = @_;
foreach my $f (@files) {
- `cvs -q update -C "$f"`;
+ system('cvs', '-q', 'update', '-C', $f);
if ($?) {
warn "Warning! Failed to cleanup state of $f\n";
}
}
}
+# An alterative to `command` that allows input to be passed as an array
+# to work around shell problems with weird characters in arguments
+# if the exec returns non-zero we die
+sub safe_pipe_capture {
+ my @output;
+ if (my $pid = open my $child, '-|') {
+ @output = (<$child>);
+ close $child or die join(' ',@_).": $! $?";
+ } else {
+ exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
+ }
+ return wantarray ? @output : join('',@output);
+}